iBTC is synthetic Bitcoin released in November of 2022 as part of Indigo Protocol v1. The Indigo Protocol is a CDP (Collateralized Debt Position) based DeFi protocol that brings capital-efficient synthetic assets to the Cardano ecosystem. Users can purchase iBTC from a DEX just like any Cardano native asset, or can mint iBTC within the Indigo Protocol by depositing ADA as collateral.